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Guitar Preamp Effects loop problem

KWXYZ

Jan 25, 2021
16
Joined
Jan 25, 2021
Messages
16
Hi,

I have a ADA guitar preamp that has a effects loop problem?

The Stereo Sends are working A, B, The Returns are not.
I don't know if it could be something as small as a resistor, diode, transistor,
or something more complex in the diagram electronic digital switch?

I think the problem lies within Channel B because it clips and goes away. (only dry signal)

Most places wont’ touch rack mount guitar gear?

I’ll post links to the PDF in case.

http://adadepot.com/mods/ADA-MP2-chorus_effects-loop_noise-gate.pdf

http://adadepot.com/mods/ADA-MP2-loading-chart.pdf

You can hear the return on B channel over modulated then it goes away.
the A is silent.

It's in very good condition but with this issue.

Unfortunately I’m a novice with a schematic but have good solder skill and have both a

DMM and a Cap meter. I made minor repairs but this is something out of my league.


Any advice


Appreciated
 
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